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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Activity Related to Asset Retirement Obligations
Activity related to the Company’s asset retirement obligations is as follows:
(In thousands)
 
Six Months Ended 
 June 30, 2015
Balance at beginning of period
 
$
126,655

Liabilities incurred
 
6,969

Liabilities settled
 
(203
)
Accretion expense
 
3,342

Balance at end of period
 
$
136,763